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Artificial Organs

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https://www.readbyqxmd.com/read/29119570/timing-of-intra-aortic-balloon-pump-placement-before-off-pump-coronary-artery-bypass-grafting-and-clinical-outcomes
#1
Feng Liu, Feng Yang, Zhongtao Du, Na Miao, Yanyan Zhao, Bo Xu, Xiaotong Hou
We aimed to evaluate the timing of preoperative intra-aortic balloon pump (IABP) placement and outcomes in patients undergoing off-pump coronary artery bypass grafting (OPCAB). Patients with prophylactic IABP placement before OPCAB presenting between January 1, 2010 and December 31, 2013 were included. Patients were categorized into two groups based on the timing of preoperative IABP placement: less than 2 h (Group A, n = 223) and more than 2 h (Group B, n = 94). According to the European System for Cardiac Operative Risk Evaluation (EuroSCORE), patients were divided into two subgroups: middle-low EuroSCORE (<6, Groups A1 and B1) and high EuroSCORE (≥6, Groups A2 and B2)...
November 8, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29105103/development-of-a-pediatric-cardiac-mechanical-support-program
#2
Abhishek Kashyap, Joseph W Turek, Samantha J Wagner, Laura Felderman, Elizabeth A Jaggers, Peter J Gruber, R Erik Edens
The development of a pediatric cardiac support program is a complex, multidisciplinary project. This study describes the University of Iowa Congenital Heart Program's experience from its inception to the present. In, we examine those specific factors that have led to substantial improvements in the program, additionally identifying where further gains can be made. We retrospectively reviewed all pediatric patients who received mechanical cardiac support at the University of Iowa from the inception of the program in 1991...
November 3, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29094351/standardized-comparison-of-selected-physiological-controllers-for-rotary-blood-pumps-in-vitro-study
#3
Anastasios Petrou, Jongseok Lee, Seraina Dual, Gregor Ochsner, Mirko Meboldt, Marianne Schmid Daners
Various physiological controllers for left ventricular assist devices (LVADs) have been developed to prevent flow conditions that may lead to left ventricular (LV) suction and overload. In the current study, we selected and implemented six of the most promising physiological controllers presented in literature. We tuned the controllers for the same objectives by using the loop-shaping method from control theory. The in vitro experiments were derived from literature and included different preload, afterload, and contractility variations...
November 2, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29076174/new-technology-mimics-physiologic-pulsatile-flow-during-cardiopulmonary-bypass
#4
Gengo Sunagawa, Jamshid H Karimov, Raymond Dessoffy, Nicole Byram, Patrick Grady, Martin Sinkewich, Jeffrey P Naber, Douglas Vincent, Shinji Okano, Robert D Stewart, Shiva M Sale, Nader Moazami, Kiyotaka Fukamachi
The VentriFlo True Pulse Pump (Design Mentor, Inc., Pelham, NH, USA) is the first blood pump designed to mimic human arterial waveforms in a standard oxygenation circuit. Our aim was to demonstrate the feasibility and safety of this pump in preparation for future studies to determine possible clinical advantages. We studied four piglets (41.4-46.2 kg): three with an implanted VentriFlo pulsatile pump and one with the nonpulsatile ROTAFLOW pump (MAQUET Holding B.V. & Co. KG, Rastatt, Germany) as a control. Hemodynamics was monitored during 6-h cardiopulmonary bypass (CPB) support and for 2 h after weaning off CPB...
October 27, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29068081/a-new-pressure-guided-management-tool-for-epidural-space-detection-feasibility-assessment-on-a-simulator
#5
Massimiliano Carassiti, Alessia Mattei, Rossella Quarta, Carlo Massaroni, Paola Saccomandi, Marco Tesei, Roberto Setola, Emiliano Schena
The detection of epidural space is usually performed by the technique of loss of resistance (LOR) without technological support, although there are few commercial options. We sought to design and develop a new noninvasive system able to detect the LOR without any changes to the conventional procedure. It allows detecting the LOR by a custom made algorithm. The system provides a visual and acoustic feedback when the LOR is detected. We optimized the detection algorithm and investigated the performance of the system during experiments on a custom simulator...
October 25, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29068076/emg-based-estimation-of-limb-movement-using-deep-learning-with-recurrent-convolutional-neural-networks
#6
Peng Xia, Jie Hu, Yinghong Peng
A novel model based on deep learning is proposed to estimate kinematic information for myoelectric control from multi-channel electromyogram (EMG) signals. The neural information of limb movement is embedded in EMG signals that are influenced by all kinds of factors. In order to overcome the negative effects of variability in signals, the proposed model employs the deep architecture combining convolutional neural networks (CNNs) and recurrent neural networks (RNNs). The EMG signals are transformed to time-frequency frames as the input to the model...
October 25, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29032583/third-generation-ventricular-assist-device-mid-term-outcomes-of-the-heartware-hvad-in-pediatric-patients
#7
Mustafa Pac, Sinan Sabit Kocabeyoglu, Umit Kervan, Dogan Emre Sert, Serhat Koca, Ibrahim Ece, Feyza Aysenur Pac
The HeartWare HVAD is a small, third generation continuous flow pump that is intracorporeally placed for support of a failing ventricle in adult patients. This device is small in size when compared to other left ventricular assist devices and can therefore be used in smaller sized pediatric patients. We present our initial experience using the HVAD as a bridge to heart transplantation in the pediatric population. We performed a retrospective, single center, nonrandomized review of 17 pediatric patients who underwent HVAD implantation between June 2013 and March 2016...
October 15, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29028131/a-motion-analysis-protocol-for-kinematic-assessment-of-poly-articulated-prosthetic-hands-with-cosmetic-gloves
#8
Andrea Giovanni Cutti, Francesca Cordella, Giulia D'Amico, Rinaldo Sacchetti, Angelo Davalli, Eugenio Guglielmelli, Loredana Zollo
To provide upper-limb amputees with devices that best fit their needs and to test innovative solutions, it is necessary to quantitatively appraise a device performance with rigorous measurement methods. The aim of this work was to define an optimal motion analysis protocol, suitable for optoelectronic systems, to measure the kinematics of poly-articulated hands even when covered by a cosmetic glove. This is a fundamental aspect, because gloves can decrease device speed and range of motion and, ultimately, patients' acceptance of the artificial limb...
October 13, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29027689/oral-mucosa-model-for-electrochemotherapy-treatment-of-dog-mouth-cancer-ex-vivo-in-silico-and-in-vivo-experiments
#9
Daniela O H Suzuki, José A Berkenbrock, Marisa J S Frederico, Fátima R M B Silva, Marcelo M M Rangel
Electrochemotherapy (EQT) is a local cancer treatment well established to cutaneous and subcutaneous tumors. Electric fields are applied to biological tissue in order to improve membrane permeability for cytotoxic drugs. This phenomenon is called electroporation or electropermeabilization. Studies have reported that tissue conductivity is electric field dependent. Electroporation numerical models of biological tissues are essential in treatment planning. Tumors of the mouth are very common in dogs. Inadequate EQT treatment of oral tumor may be caused by significant anatomic variations between dogs and tumor position...
October 13, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29027687/filter-adsorption-of-anidulafungin-to-a-polysulfone-based-hemofilter-during-cvvhd-in-vitro
#10
Peter Kolbinger, Michael Gruber, Gabriel Roth, Bernhard M Graf, Karl-Peter Ittner
Candidemia is frequent in critically ill patients, especially in combination with an acute kidney injury (AKI). Echinocandins generally are recommended for therapy of such infections. Recent studies found no need for dosage adjustment in patients with end-stage renal disease receiving hemodialysis, or patients with AKI receiving continuous venovenous hemofiltration. The aim of this in vitro study was to examine the adsorption of anidulafungin to the surface of the hemofilter during continuous venovenous hemodialysis (CVVHD) and its effect on anidulafungin concentrations...
October 13, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29023795/real-time-ecg-simulation-for-hybrid-mock-circulatory-loops
#11
Leonie Korn, Daniel Rüschen, Niklas Zander, Steffen Leonhardt, Marian Walter
Classically, mock circulatory loops only simulate mechanical properties of the circulation. To connect the hydraulic world with electrophysiology, we present a real-time electrical activity model of the heart and show how to integrate this model into a real-time mock loop simulation. The model incorporates a predefined conduction pathway and a simplified volume conductor to solve the bidomain equations and the forward problem of electrocardiography, resulting in a physiological simulation of the electrocardiogram (ECG) at arbitrary electrode positions...
October 12, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28975643/change-in-axial-rotation-of-the-femur-in-the-resting-supine-position-following-total-hip-arthroplasty
#12
Keisuke Uemura, Masaki Takao, Hidetoshi Hamada, Takashi Sakai, Nobuhiko Sugano
Stem anteversion in the setting of total hip arthroplasty (THA) is usually measured by referencing the posterior condylar line (PCL). However, stem anteversion may not express the functional torsion of the femur if a consistent horizontal tilt in the PCL is observed after THA. Herein, the horizontal tilt of the PCL at the resting neutral position of the hip was retrospectively measured in 53 THA patients from three computed tomography (CT) datasets: (i) preoperative (preop-CT), (ii) 3 weeks after THA (1st postop-CT), and (iii) more than 2 years after THA (2nd postop-CT)...
October 3, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28971487/application-of-a-simplified-hand-sewn-trileaflet-valved-conduit-in-right-ventricular-outflow-tract-reconstruction-as-an-alternative-for-bovine-jugular-vein-graft-single-center-experience
#13
Hui-Feng Zhang, Ming Ye, Xian-Gang Yan, Gang Chen, Qi-Lin Tao, Bing Jia
The Bovine jugular vein (BJV) graft for right ventricular outflow tract reconstruction (RVOT) is limited applied due to possible graft failure. In this study, we reported the clinical application of simplified hand-sewn trileaflet valved conduit as an alternative for BJV graft. We retrospectively included 68 patients underwent 76 conduits implantation including 22 new simplified hand-sewn trileaflet valved conduits (Group A) and 54 BJV grafts (Group B). For patients in Group A, a hand-sewn trileaflet valved conduit with valves made of autologous pericardium or expanded polytetrafluoroethylene was applied...
October 2, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28940550/evaluation-of-combined-extracorporeal-life-support-and-continuous-renal-replacement-therapy-on-hemodynamic-performance-and-gaseous-microemboli-handling-ability-in-a-simulated-neonatal-ecls-system
#14
Kaitlyn R Shank, Elizabeth Profeta, Shigang Wang, Christian O'Connor, Allen R Kunselman, Karl Woitas, John L Myers, Akif Ündar
The objective of this study was to evaluate the hemodynamic performance and gaseous microemboli (GME) handling ability of a simulated neonatal extracorporeal life support (ECLS) circuit with an in-line continuous renal replacement therapy (CRRT) device. The circuit consisted of a Maquet RotaFlow centrifugal pump or HL20 roller pump, Quadrox-iD Pediatric diffusion membrane oxygenator, 8-Fr arterial cannula, 10-Fr venous cannula, and Better-Bladder (BB) with "Y" connector. A second Quadrox-I Adult oxygenator was added postarterial cannula for GME experiments...
September 21, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28929512/systematic-design-of-a-magnetically-levitated-brushless-dc-motor-for-a-reversible-rotary-intra-aortic-blood-pump
#15
Yaxin Wang, Thomas G Logan, P Alex Smith, Po-Lin Hsu, William E Cohn, Liping Xu, Richard A McMahon
The IntraVAD is a miniature intra-aortic ventricular assist device (VAD) designed to work in series with the compromised left ventricle. A reverse-rotation control (RRc) mode has been developed to increase myocardial perfusion and reduce ventricular volume. The RRc mode includes forward rotation in systole and reverse rotation in diastole, which requires the IntraVAD to periodically reverse its rotational direction in synchrony with the cardiac cycle. This periodic reversal leads to changes in pressure force over the impeller, which makes the entire system less stable...
September 20, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28913873/improvement-of-decellularization-efficiency-of-porcine-aorta-using-dimethyl-sulfoxide-as-a-penetration-enhancer
#16
Selcan Guler, Halil M Aydin, Lan-Xin Lü, Ying Yang
Decellularization of tissues and organs enables researchers to obtain extracellular matrix (ECM) with the natural conformation and chemical composition of specific tissues. However, drawbacks exist such as the structural alteration of ECM or loss of some important components in ECM due to overexposure to chemicals during the decellularization process. In this study, porcine aorta was decellularized by sodium dodecyl sulfate (SDS). Dimethyl sulfoxide (DMSO) was used as a penetration enhancer in the decellularization process to enhance the penetration of SDS, consequently reducing the exposure time of SDS to treated tissues...
September 15, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28891190/is-multiple-overlapping-uncovered-stents-technique-suitable-for-aortic-aneurysm-repair
#17
Siang Lin Yeow, Hwa Liang Leo
A computational fluid dynamic model to assess the impact of flow-diverter device on intra-aneurysmal flow in complex aortic aneurysm from the viewpoint of hemodynamics is presented. The aim of this study is to investigate the hemodynamic effects of an endovascular flow-diverter technique using multiple overlapping uncovered stents (MOUS) in the treatment of complex aortic aneurysm involving side branch. The placement of porous barrier such as MOUS across the aneurysm alters the blood flow pattern in the aneurysm sac...
September 11, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28891078/design-and-development-of-novel-transcatheter-bicaval-valves-in-the-interventional-treatment-of-tricuspid-regurgitation
#18
Munirah Ismail, Foad Kabinejadian, Yen Ngoc Nguyen, Edgar Lik Wui Tay, Hwa Liang Leo
The concept of heterotopic implantation of transcatheter tricuspid valve is new and has shown promising results thus far. While the Reynolds shear stress values measured in the vicinity of this valve are relatively low, the values at some time points are higher than the threshold of platelet activation. Hence, in this study, we aim to reduce these values with an innovative stent design. It was shown that the Reynolds shear stress values measured were lower than those of valves made of generic stent design and the maximum Reynolds shear stress values in the vicinity of the valves was very low (∼10 dynes/cm(2) )...
September 11, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28891072/stable-control-of-physiological-parameters-but-not-infection-in-preterm-lambs-maintained-on-ex-vivo-uterine-environment-therapy
#19
Yuichiro Miura, Haruo Usuda, Shimpei Watanabe, Eleanor Woodward, Masatoshi Saito, Gabrielle C Musk, Suhas G Kallapur, Shinichi Sato, Ryuta Kitanishi, Tadashi Matsuda, John P Newnham, Sarah J Stock, Matthew W Kemp
Ex vivo uterine environment (EVE) therapy is an experimental neonatal intensive care strategy wherein gas exchange is performed by membranous oxygenators attached to the umbilical vessels. Our aim was to assess the ability of a newly refined EVE system to maintain key physiological parameters in preterm lambs within optimal ranges for 48 h. EVE group; n = 6: Preterm lambs were delivered under general anesthesia at 115 ± 2 days of gestational age. Animals were submerged in a bath of artificial amniotic fluid on EVE therapy for 48 h...
September 11, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28884833/circulatory-flow-restoration-versus-cardiopulmonary-resuscitation-new-therapeutic-approach-in-sudden-cardiac-arrest
#20
Sayed Nour, Daniel Carbognani, Juan Carlos Chachques
Sudden cardiac arrest (SCA) remains a major problem for health authorities worldwide. Insufficiencies of current cardiopulmonary resuscitation (CPR) are most probably related to an inappropriate concept and applied methods that still concentrate on heartbeat as priority, instead of blood circulation to maintain organs' perfusions. The aim of this works is to propose a new therapeutic approach for SCA in a more effective and secure manner compared with current CPR methods. It correlates to a non-invasive circulatory flow restoration (CFR) device composed of a multilayered thoracic and infradiaphragmatic compartments that will be pulsated alternatively and in fixed frequencies using a low-pressure pneumatic generator...
September 8, 2017: Artificial Organs
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